POLYMERISATION OF ALPHA-MONO-OLEFINS USING CATALYST HAVING A MIXTURE OF STRONG AND WEAK SELECTIVITY CONTROL AGENTS

摘要

A process for the polymerization of an alpha monoolefin in the presence of certain supported coordination catalysts systems which comprise (a) a procatalyst, (b) a cocatalyst and, (c) a selectivity control agent, wherein… (a) is a solid composition comprising magnesium chloride, titanium tetrachloride, and an electron donor;… (b) is an aluminium trialkyl; and… (c) is a combination of a strong selectivity control agent and a weak selectivity control agent.